I bought two batches from her last year and they were excellent. Most places I've seen don't sell mangosteen loose. I've seen them come in netted packages, or wrapped in the little styrofoam trays. I avoid the wrapped in styrofoam because I usually can't spot if they're fresh.

I remember answering this question for someone before - so that information is in one of the threads if you search the board. To me, they taste like a combination of slightly tart with a peachy subtle sweetness - there's a fragrance to its flesh that, like a peach, infuses each bite, but not as strong as peach. The texture is very much like the flesh of a lychee.